<template>
  <div class="login_container">
    <el-row>
      <el-col :span="12" :xs="0"></el-col>
      <el-col :span="12" :xs="24">
        <el-form
          class="login_form"
          :model="loginForm"
          :rules="rules"
          ref="loginForms"
        >
          <h1>Hello!</h1>
          <h2>欢迎使用！</h2>
          <el-form-item prop="username">
            <el-input
              :prefix-icon="User"
              v-model="loginForm.username"
            ></el-input>
          </el-form-item>
          <el-form-item prop="password">
            <el-input
              type="password"
              :prefix-icon="Lock"
              v-model="loginForm.password"
              show-password
            ></el-input>
          </el-form-item>
          <el-form-item>
            <el-button
              :loading="loading"
              class="login_btn"
              type="primary"
              size="default"
              @click="login"
            >
              登录
            </el-button>
          </el-form-item>
        </el-form>
      </el-col>
    </el-row>
  </div>
</template>

<script setup lang="ts">
import { User, Lock } from '@element-plus/icons-vue'
import { reactive, ref } from 'vue'
import { useRouter, useRoute } from 'vue-router'
import { ElNotification } from 'element-plus'
//引用获取时间函数
import { getTime } from '@/utils/time'
//引入用户相关的小仓库
import useUserStore from '@/store/modules/user'
//获取el-from组件
let loginForms = ref()
import { ElForm } from 'element-plus'
let useStore = useUserStore()
//获取路由器
let $router = useRouter()
let $route = useRoute()
//定义变量控制按钮加载效果
let loading = ref(false)

//收集账号密码的数据
let loginForm = reactive({ username: 'admin', password: 'atguigu123' })
//登录按钮回调
const login = async () => {
  //保证全部表单项校验通过再发请求
  await loginForms.value.validate()
  //加载效果，开始加载
  loading.value = true
  //点击登录按钮以后干什么
  //通知仓库发送登录请求
  //请求成功以后，跳转到首页
  //请求失败，提示错误信息
  try {
    //可以书写.then
    //保证登录成功
    await useStore.userLogin(loginForm)
    //判断登录时，路由路径是否有query参数，有则跳转，否则跳转到首页
    let redirect: any = $route.query.redirect
    $router.push({ path: redirect || '/' })
    //编程式导航跳转到展示数据首页
    //登录成功提示信息
    ElNotification({
      type: 'success',
      message: '欢迎回来',
      title: `HI,${getTime()}好`,
    })
    //登录成功加载效果也消失
    loading.value = false
  } catch (error) {
    //登录失败加载效果消失
    loading.value = false
    //登陆失败提示信息
    ElNotification({
      type: 'error',
      message: (error as Error).message,
    })
  }
}

//自定义校验规则函数
//
const validatorUserName = (_rule: any, value: any, callback: any) => {
  //rule是校验规则对象
  //value是表单元素的文本内容
  //函数：如果符合条件callbaack放行通过
  //如果不符合条件callback方法，注入错误信息
  if (value.length >= 5) {
    callback()
  } else {
    callback(new Error('账号长度至少5位'))
  }
}
//
const validatorPassword = (_rule: any, value: any, callback: any) => {
  //rule是校验规则对象
  //value是表单元素的文本内容
  //函数：如果符合条件callbaack放行通过
  //如果不符合条件callback方法，注入错误信息
  if (value.length >= 6) {
    callback()
  } else {
    callback(new Error('密码长度至少6位'))
  }
}

//定义表单校验需要的配置
const rules = {
  //规则对象属性：
  //required 必填项
  //min:文本长度最小值，
  //max：文本长度最大值,
  //message：提示信息
  //trigger：触发方式，blur 失去焦点时，change 改变时
  username: [
    // { required: true, min: 6, max: 10, message: '账号长度至少6位', trigger: 'change' }
    { trigger: 'change', validator: validatorUserName },
  ],
  password: [
    // { required: true, min: 6, max: 16, message: '密码长度至少6位', trigger: 'change' }
    { trigger: 'change', validator: validatorPassword },
  ],
}
</script>

<style scoped lang="scss">
.login_container {
  // --size:100%;
  width: 100%;
  height: 100vh;
  background: url('@/assets/images/background.jpg') no-repeat; //不重复
  background-size: cover; //覆盖
}

.login_form {
  position: relative;
  width: 80%;
  top: 30vh;
  background: url('@/assets/images/login_form.png') no-repeat;
  background-size: cover;
  padding: 40px;

  h1 {
    color: white;
    font-size: 40px;
  }

  h2 {
    color: white;
    font-size: 20px;
    margin: 20px 0px;
  }

  .login_btn {
    width: 100%;
  }
}
</style>
